Q6600 Overclock - 8 or 9 multiplier?

I'm going to overclock a q6600 on a 780i mobo with 800mhz memory. I'm starting at 266fsb at a 9 multiplier.

I'd prefer to eventually have 400fsb @ 8 multiplier, for 3.2mhz and 1:1 with the RAM. However, how should I get from 266@9 multiplier to 400@8?

Should I first drop the multiplier from 9 to 8, staying at 266fsb, and then gradually going from 266fsb to 400fsb? Or should I stay at a 9 multiplier, and up the fsb to 355, which gives 3.2mhz, and then after testing for stability, just make the final BIOS change from 9 to 8 multiplier, and 355fsb to 400fsb.

I hope this question is clear. I'm just trying to find out what should be the order of my tweaking. Change fsb first from 266>355, then at the end change the mult. from 9 to 8, and the fsb from 355 to 400? Or just drop the multiplier first to 8, and then all I have to do is get up to 400fsb.

ok, well lets assume that I choose 8x400. do you think I should drop the multiplier first then creep up to 400? or should I stay at 9 until i get up to 355 (still 3.2), and then at the same time drop the mult to 8 and up the fsb to 400. assuming I'm stable at 355x9, is there any danger with simultaneously dropping mult and upping fsb.